Work holder for grinding profiles



Aug. 30, 1949. H. E. TRESIDDER 2,480,613

WORK HOLDER FOR GRINDING PROFILES Filed June 27, 1946 5 Sheets-sheaf 1 INVENTOR. E Herberf E. Tresidder 8- 1949. H. E. TRESIDDER 2,480,618

WORK HOLDER FOR GRINDING PROFILES Filed June 27, 1946 5 Sheets-Sheet 2 IN VEN TOR.

Herbert E. Tresidder A TTORE 5 H. E. TRESIDDER WORK HOLDER FOR GRINDING PROFILES Aug. 30, 1949.

. 5 Sheets-Sheet 3 Filed June 2'7, 1946 ww H; m MIN Q wv 1 l. x w k g Q Q. I 1% mm H l l: l E S l 3 .3 av

INVENTOR. Herbert E. Tresidder BY A ATTORNEY' 5 Sheets-Sheet 4 INVENTOR. Herbert E. Tresidder FATTORNEY Aug. 30, 1949. H. E. TRESIDDER WORK HOLDER FOR GRINDING PROFILES Filed June 27, 1946 1949. H. E. TRESIDDER I 2,480,618

WORK HOLDER FOR GRINDING PROFILES Filed June 27, 1946 5 Sheets-Sheet 5 E INVENTOR. Herbert E. Tres/dder MTTORNEY a Patented Aug. 30, i949 U T D-LST T 4' Wonk HOLDER FOR GRINDING PROFILES Herbert E. Tresidder; Royal ak, Mi c h. Application June27,1946, Serial No. 679,820

6 Glaims. (01. 51-437? This invention relates to adjustable work holders and particularly holders adjustable to vary presentation of work to a surface, grinder.

The object of the invention is to provide a work holderhaving suchextensive adjustments for variously presenting .work to a grinding wheel as to largely eliminate the common practice of dressing grinding wheels to a profile determined by the work. V

More specifically, the invention has for its objects, the provision of a holder adapted to undergo .a wide range of diverse rotary and sliding motions with respect to a grinding wheel, such that almost any desiredv work. profile may be ground by proper manipulation of the holder without departing from standard types of grinding wheels.

.These and various other objects are attained by the construction hereinafter described and illustrated in the accompanying drawings, wherein:

Fig. 1 is a top plan view of my improved work holder.

Fig. 2 isa side elevational view thereof.

Fig.3 is a front view of the holder.

' Fig. 4 is an axial vertical sectional view taken on the line 4-4 of Fig. 1.

Fig. 5 is an axial horizontal section, taken on 55 of Fig. 2.

Fig. 6 is a vertical cross section taken on 6-5 of Fig.2. V

Fig. 7 is a vertical cross section taken on 1-1 of Fig. 2.

Fig. 8 is a front view differing from Fig. 3 as to the illustrated position of the work-holding slide and showing a work piece being ground.

Figs. 9 and 10 are perspective views of different types of profiled pieces, such as my work holder makes available.

Fig. 11 isan elevational View of another type of work piece suited to production by my work holder.

1 Figs. 12 and 13 arerespectively a top plan view and a side view of a. complex grinding job to which my holder is suited.

Figs. 14 and 15 are top and side views of another ground piece illustrating the possibilities of. this work holder.

In these views, the reference character I designates a base plate adapted by keyways 2 and bolt holes 3, for rigid mounting on the table of a grinding machine (not shown). Integrally upstanding from a margin of the plate I is a plate 4, on the upper portion of which there is rigidly mounted by screws 4a a forwardly projecting cirparallel with said base plate. Ihe parts. I, 4 and 2Q.-tially withdrawing from the, disk H a screw l4 cular casing 5, upwardly spaced from and axially 5 jointly form a mounting for mechanism now to be described. Journaled in said casing at its axis is a shaft 8 loosely mounting a wormwheel. "I. adapted to be driven by a worm 8. The shaft 9 of such worm rigidly. carries a crank disk lil.

exposed: through the outer periphery of the casing, toaiforda manual drive to the worm. The drive to the shaft 6 through the worm and worm wheel is, of .course, quite gradual, and it is desirable at times to turn said shaft rapidly. Hence there is fixed on the shaft a large crank disc l I, the handle I2 of which is accessible through and orbitally revoluble in a circular opening it in the.

top portion of the plate4, such disk serving as a rotative closure for. such opening. To afford actuation of the shaft 6 by thediskl I, it is necessary first to overcome. the locking effect of the worm and worm wheel. This is accomplished by parhaving its inner end normally socketed in the wormwheel -and.forming with said disk a drive connection from-the wormwheel to the shaft.

Fixed on the shaft 6 and rotatively engaging the front ofthe casing 5 is acircular table l5, preferably equal in diameter, to the casing. As illustrated, this .tableissecured by screws 6 to an annular flange l'lon the shaft. Diametrically extended across the front face of said table is a dovetail groove 18, slidably receiving a correspondingly shaped, tongue I9 on a plate seated against said table. The plate 23 is adapted to be fed along the grooved diameter of the table by a screw 2| engaging a nut 22 fixed on said plate, such screw being journaled at the ends of the groove [8 in lug-s 23 on said table, the groove havparts 29, 26, and 2'! jointly form a slide adjustable across the table l5. At the axis of the casing 2'! is journaled a shaft 28 mounting a wormwheel 29 in said casing. A worm 30 driving such wormwheel and journaled in the casing, carries an actuating crank disk 3! exposed through the outer' periphery of the casing. I rapid rotative actuation of the shaft 28, the

To permit a relatively latter rigidly carries a crank disk 32 of which the handle 33 is accessible through and orbitally revoluble in a circularopening 34 in the supPQrt 3 26, said disk forming a closure for such opening. the slides 39 and 20, 2B, 21 are set, as for ex- A screw so normally secures the wormwheel 29 to ample when a surface requires several spaced the disk 32 and may be withdrawn from the parallel arcuate beads or channels. wormwneei when the disk is required to rotate the Setting up work is greatly facilitated by proshalt independently or the worm and wormwheel. 5 viding, when desired, for a rapid rotative adjust- Fixed on the shaft 28 and rotatively engaging ment or" either table, as when the tables are h casing l i a s con circul r table 36 prefturned by their crank handles l2 and 33. The e y qual in diameter to said casing. The much more gradual rotation derived from the face of such table remote from the casing is diaw m d wormwheel drive is suited to the acmetricaliy formed with a dovetailgroove 31, 1o tual rinding of a radius.

slidab y ceiv a correspondingly shape The dressing of grinding wheels to'a desired tongue 33 011 a Slide 39 adapted to be fed 516F058.v work contour generally requires considerable time the table 30 by a screw 40 recessed in such table and kin, i d ition t a, fairly costly machine, and rotatab e y a Crank ki'i xhfiw n i a: ha e I and a wheel dressedto a certain profile is unfiia. The face o t Slide 39 DHQS that 1 suited for any other grinding uses, In many a g the table 36 is diametricallygroov shops, a large number of dressed grinding wheels, at 42 transversely t0 t ton ue 33 of .aid$ i e each suited to a single profiling job occasionally to receive a tongue 63 on a work-receiving slide required, represent heavy i e t ent, Hence 44 formed with T slots lia facilitating the rigid ma hine eliminating necessity for grinding attachment of work to such slide. The Slide wheel dressing afiords a highly desirable economy. aybe S i i y shifted outwa dly: and inwa y Necessityfor dressing a grinding-- wheel works from the axis of the .cncu'iar-..tablet36 by a scr a particular hardship on a manufacturer or tool l'ii rotative by a crank disk .'i'lzhesvmge n and die shop, whenthe piece to be profiled is res-s 41a, it being important to note that the radial. quired only in a n quantity,

Shifting effected y- Screw 451$ transverse '25 While profiles-are not necessarily produced by to that eiiected by the-screw. 4B. a dressedgri-nding wheel, the laborious and-te-..

In-use oiithe described work holdena piece o dious matter: of resetting the piece each time a Work such as 1S exemplified g. 8h diiferent radius is employed or a tangent is res mounted on the slide/.44 may be eyiilldrieally quired is generally less economical than the dress. ground by gradually rotating either of .the; tables mgoperation.

l5 and 38 .on its axis while such wor Extensiverange of profiles=which the described: driven din W e 49. ad wh work-holder makes availableds .well shown by? the Wheelg- WOIK a Will be grellndis Figs.-8.-i5 inclusive. Fig. 8 shows a work piece 52" determine y spacing Ofsueh faeeirem theiexisi positioned for grinding of a convexly arcuate' of aifi $11011 Spacing being seleetilielil estabe 3& surface through rotary:actuati0n of the table 'l5. lished by turning Of the corresponding feed SCIEW... Fig; ,9 perspectively hows .a, piece of ork; exa- By such turning, the slide operable by aidser w: emplifying the adaptability of my work 'holder: and all parts carried thereby are fed diametrically to Y :the grindingof smoothly. merging reverse across such table. Manipulation of the screw):- Thuszza channelw55lis formed-between and resultant shifting of the slidete iaffordse-a or two-ribsSGLthe'channelhavinga concave cur-.1 somewhat finer adjustm t han su tsl' vature mergingintoz'the relatively small radius sliding the plate 20, since the latter is actuated by convex curvatures of the ribs. The outer facesot' a relative y arse' d r wyars r d the ribs are concavelycurved-to a radiusdifiering radius, however, rbeing available from-the ing from that ofthe othercurves, and plane last-mentioned screw. ccor as. thesure. panels 5 1 at opposite sides'of theribs angularly fac to be Profiled is shifted to one side orcthe intersect the concave outenfac'es of the ribs other of the axis of work rotation, such surface- Fig. lfl perspectively shows awork piece ground is ground to a convex orconcave cylindricalform,:= to a cylindrical curvature at 58, suchcurvature thearcuate extent of the area groundzbeing regmerging smoothly into a plane face 59, which ulatedbythe angle throughwhich*thetablehl-i'or" 5 in turn merges into a relatively small-:radius: 36 is rotated. Thisangle maybe veryaccurately conc cmm controlled, since a scale. of threehundredand Fig. 11 exemplifies a job entailing a convex: sixty degrees is marked on the periphcryvof each spherical face 53; merging intoaconcavelyicirrotary table and correspondingaindex lines and cular face- 54: 5| are marked respectively on the casings-5 and. Fig.'l2 a topplan'viewand Efig'. -13'a side el'e 1, vation of a stepped-frusto pyramid of generally When a required workprofile. includesanzan: reetangularform'rbut havingthe corners:of its cuate surface merging tangentially into a plane: steps ground away to form triangular-facets et; face, the arcuate faceis ground as has beende similarly inclined to the vertical: axis of the pyrascribed, by rocking one-- of the :rotary-vtahles. 50 mid This-iillustrates-how the holder'may rm' through the proper arc, and-therequire'd tangentatively index a piece to establish positions for' tial feed is then applied byshifting the-slideformingequian'gularly spaced' faces,"which'niay mounted on such table a suitable distance. be inclined asdesiredftothe axis about=which the this same manner, a series of arcs withdntervenpiece is indexed.

ing tangents may be ground, 'and'mergedper-15' Figs-'M'a'nd 15 are respectively'a topplan vlew feetly one into the other. and side elevation' of an equilateral eight -sided Spherical surfaces may be ground bysimultanepyramid, further illustrating the 'adaptabilityor' ously rotating both tables -l5-and 36wh-il'e enmy-work-holder--toderive an indexing-function gaging the work with the grinding-whe'el,-thefrom one rotary table-while the othe'r providesslides engaging such-tables being; adjusted to ma desired inclinationto the=axis-of the piece" establish equal radii. for grindingl'ateralfaces-thereof."Any-pyramidal Sliding adjustability of thework-receiving slide or" frustcpyramidal-dorm can be -readily prowith respect to its supportingslide 39 is primarily duced bythe-improved liolden useful in permitting repetition on; a piece-of The high'versatility ofthe described work-1 m;

workgof a profile form-fonwhich-one or-both of en "its 'primaryadvantagepthere "havingbeen no prior holder suited to produce either cylindrical convexities or concavities, with accurate tangents to either, and further suited to produce either spherical convexities or concavities. It is further believed original and highly desirable to permit a piece of work to be ground, without resetting, with arcuate surfaces having relatively transverse axes of curvature. It is moreover important to note that this holder permits of grinding many peculiar forms that cannot be achieved by dressing a grinding wheel.

What I claim is:

1. In a holder for work to be ground, a rotary table, a worm and wormwheel drive for the table, a crank disk coaxial with and forming an alternative drive for the table, a mounting for the table encasing said worm and wormwheel and compris ing an opening closed by said disk, a handle disposed in said opening for rotating the disk, and means for attaching work to the table.

2. In a holder for work to be ground as set forth in claim 2, a drive connection from the Wormwheel to the disk, releasable to afiord actuation of the table by the disk, independently of the worm and wormwheel.

3. In a holder for work to be ground, a shaft, a rotary table fixed on said shaft, a wormwheel loose on the shaft, a worm meshing with the wormwheel, means for manually rotating the worm wheel, a mounting for said shaft encasing the worm and wormwheel, a crank disk fixed on said shaft for driving the table independently of the worm and wormwheel, and a releasable drive connection from the wormwheel to the disk, whereby the disk forms a means for driving the shaft from the wormwheel or for driving the shaft independently of the wormwheel, and means for attaching work to said table.

4. In a holder for work to be ground, a rotary table, a mounting for such table, means for manually rotating the table on its mounting, a slide mounted on the table, means on the table for guiding the slide across the axis of table rotation, a second rotary table mounted on said slide to rotate about an axis transverse to that of the first-mentioned table, a second Slide mounted on and movable across the axis of the second table, and a work-receiving slide mounted on the second slide for travel transverse to that of the second slide.

5. In a holder for work to be ground, a rotary table, a mounting for such table, means acting at the axis of rotation of said table for rotating the table on said mounting, a slide mounted on the table, a guideway for said slide carried by the table in a substantially diametrical relation to said axis of rotation, a speed-reducing means for actuating the slide along the guideway, a second rotary table mounted on said slide with its axis of rotation transverse to the first-mentioned axis, means acting at the axis of rotation of the second table for rotating such table, a second slide mounted on the second table, a guideway for the second slide carried by the second table in a substantially diametrical relation to the axis of rotation of such table, speed-reducing means for actuating the second slide along its guideway, and means for attaching work to the second slide.

6. In a holder for work to be ground, a rotary table, a mounting for such table, means for manually rotating said table on its mounting, a slide mounted on said table, means on said table for guiding the slide in a rectilinear travel diametrical to the axis of table rotation, a speed-reducing means for actuating the slide in such travel, a second rotary table mounted on said slide to rotate about an axis in fixed parallelism to said rectilinear travel, a second slide mounted on the second table, means on the second table for guiding the second slide in travel diametrical to the axis of rotation of such table, a speed-reducing means for actuating the second slide, and means for attaching work to the second slide.

HERBERT E. TRESIDDER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

